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amd Phenom ii 955 video card/memory problem

the problem being is the motherboard will not recognise the graphics card with the latest drives and older ones to test, the strange thing is if i take a stick of memory out it boots up in single memory mode and recognises the card straight away, likewise if i install another module to make it 6gb it fires up perfectly and plays CODMW3 no problem but if i am doing office work after about 30minutes the screen starts to flicker and black lines appear through writing then finally the BSOD comes up complaining about one of the graphics card drivers, dont get me wrong i have played COD for ages and not had a problem, i am at a bit of a loss i want 6gb memory ideally but the system becomes unstable, the system works great as an office computer with 4gb of memory but wont play videos or do video editing because it doesnt recognise the card. Any help would be appreciated.

The problem as listed above is the computers can run with 2gb of ram boot up and recognise the graphics card, increase to 4gb of exactly the same ram in the first 2 slots the computer boots up recognises the memory as 4gb but doesnt recognise the graphics card, likewise if i put in another stick exactly the same as the other 2 to make 6gb it boots fine recognises the graphics card but only lasts like 30minutes before becoming unstable and crashing, the os is 64bit windows 7 pro, i have 2 exactly the same spec and build pcs and both exibit the same symptoms. for what i use the computer for i want to avoid upgrading the graphics card as i dont feel the need as with 2gb or 6gb of memory it plays codmw3 fine full.

i have installed in pairs, when i have 2x 2gb in the first 2 slots the graphics card is not recognised, if i have 1 2xgb stick in the graphics card shows up, if i have 6gb in the card shows up but fails after 30mins or so. the memory is unbranded...:-) but i have 8gb mixed and matched same problem on both.

I do not think your mobo likes the cheapo RAM. I tend to check the Memory QVL Asrock as one of the biggest problems I have come across is RAM compatibility so it is always worth checking before you buy.

i dont understand how it works with 2gb perfectly and recognises the graphics card add another 2gb and it doesnt recognise the graphics card add another 2gb of the same ram to make 6gb and it works for 30minutesish on office tasks but hours playing intensive games, i have tested all of the memory and it all works ok i have maxxed it out 6gb worth as soon as the computer boots and have no problem within 30 minutes i have opened hundreds of high quality photos at once to utilise all of the memory and this has worked fine and have played codmw3 full graphics for ages, i just dont understand, i want to use 2 monitors but having them hooked up the second monitor flickers intermitantly then i get a foghorn type sound through the speakers if i dnt restart then it will crash shortly after complaining about the graphics card driver.

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